﻿<!DOCTYPE html>
<html>
<head>
  <title>Balloon Links</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="A demonstration of the BalloonLink extension for implementing word balloons or speech bubbles as comments in diagrams about particular objects." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script src="BalloonLink.js"></script>
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this

      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
        {
          "undoManager.isEnabled": true  // enable undo & redo
        });

      // define a simple Node template
      myDiagram.nodeTemplate =
        $(go.Node, "Auto",  // the Shape will go around the TextBlock
          $(go.Shape, "Rectangle", { strokeWidth: 0 },
            // Shape.fill is bound to Node.data.color
            new go.Binding("fill", "color")),
          $(go.TextBlock,
            { margin: 8 },  // some room around the text
            // TextBlock.text is bound to Node.data.key
            new go.Binding("text", "key"))
        );

      myDiagram.linkTemplate =
        $(BalloonLink,
          $(go.Shape,
            { stroke: "limegreen", strokeWidth: 3, fill: "limegreen" }
          )
        );

      // create the model data that will be represented by Nodes and Links
      myDiagram.model = new go.GraphLinksModel(
        [
          { key: "Alpha", color: "lightblue" },
          { key: "Beta", color: "orange" }
        ],
        [
          { from: "Alpha", to: "Beta" }
        ]);
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:300px; height:300px"></div>
  <p>
    A <b>BalloonLink</b> is a custom <a>Link</a> that draws a "balloon" shape around the Link.fromNode.
    It will create a triangular shape with the base at the fromNode and the other point at the toNode.
    It is defined in its own file, as <a href="BalloonLink.js">BalloonLink.js</a>.
  </p>
  <p>
    Usage can also be seen in the <a href="../samples/comments.html">Comments</a> sample.
  </p>
</div>
</body>
</html>